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manual exchange (manual relay system)
meaning in Chinese
[电学] 人工交换机(人工转报系统); 人工电话交换机(人工中继系统)、电话通信; 手动交换(手动中继系统); 手动交换(手动继电器系统)
Related Words
manual engraving
manual entry unit
manual exchange (manual relay system) telephonic communication
manual exchange telephonic communication
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